When Michael Brown, 3, was officially adopted Tuesday by the Brown family of Phoenix, Arizona, his reaction was so beautiful, his new sister Dezhianna, 17, posted pictures of the moment on Twitter, which almost immediately went viral.

Michael first came to the family as a foster child in February of 2015, Dezhianna told BuzzFeed. Whereas he used to be very shy and cry often, Dezhianna said he’s now the happiest child: “Now when he sleeps with me, he’ll roll over in the morning and get super close to my face and say, ‘Dae, I so happy.’ … His last name was already Brown so we knew it was meant to be.”

Dezhianna added, "I don't think he truly understood what being adopted meant, he just knew he was being adopted.” Michael had been with two foster families before his new adoptive one and had his case plans changed over the past few years. He was originally supposed to be reunited with his biological mother but was put up for adoption while in foster care.

Brown’s tweet has close to 50,000 retweets in under two days and has the internet happy-panicking over how sweet he is.

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